Which of the following is true about the element `._(33)As` according to Modern periodic table:
Which of the following is true about the element `._(33)As` according to Modern periodic table:
A. it is a `5(th)`period element.
B. it is a p-block element.
C. it belongs to `16^(th)` group
D. It is one among typical elements.
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Correct Answer - B
Electron configuration is `[Ar]^(18) 3d^(10)4s^(2)4p^(3)`. As last electron enters in `p`-subshell it is `p`-block element and thus its group number is equal to `10 +5 = 15`. As principal quantum number of valence shell is 4, so it is `4^(th)` period element.
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